Short answer: No, don't assume that.
The following is purely based on my experience. When a manufacturer uses something other than kanthal for the coils they provide in a kit, they generally specify what type of metal those coils are made of. When it comes to the TFV12, SMOKTech mentions "Stainless Steel". That is for the actual tank construction, not the coils.
I haven't pulled the trigger on a TFV12 yet, so I don't know if there is something in the (most likely poorly written) user manual that specifies the coil material. In this scenario I would err on the side of caution and make the assumption the coils are kanthal. I could be wrong, but I have yet to see anything anywhere on the internet to prove me otherwise.
Your best bet...use power mode with those coils, not temp control mode. When you are 100% sure of the material, then use temp control.